I suck my autistic brother's dick

IAM almost 20(m) and my brother is 18. He has Autistic Disorder (Classic Autism). He can't Bath himself cause of autism and we're afraid he would drown so my mom used to bath him for about 7 almost 8 and when he turned 8 I took over. It's not like I took over it's just we both get in the tub together and wash like a quick 10 minutes nothing more. It did feel bad for me cause he's my brother. Quick 10 years past now he somewhat learnd to bath himself but not fullly. He still needs help drying. So yesterday was Monday and we both bathed together and I dried him up and he put Shorts but it did took him 10 minutes though. After that we were laying on bed and he loves cuddling and he cuddled me and he loves instagram Reel so I gave him my phone. As we were laying there he took my hand and put it on his thigh. I didn't thought much of it and after 2 minutes he is started pushing my hand to his penis and at that moment I knew he wanted pleasure I guess. So I put my hand in his shots and I started stroking his penis. After a while I know just he was making this expression that he never made before so, look I wanted him to have a normal experience as any other man would have so I took the liberty and I started sucking his penis. And I started sucking it again and again and again and after 9 or 11 or 10 minutes he came and he came in my mouth I don't know why but it it was sweeter maybe it's because it is his first time coming but it was sweeter and I don't know what the f*** is wrong with me but i swallowed it. I know she feels good because he started having this reaction on his face that he has never shown before. And just after that he went to sleep and so did I. Now as I am writing this now I am seeing that I am probably a piece of shit and I am f****** oh my God what the f*** did I did